Members of the Special Investigation Team (SIT) and the forensic team visited the area outside Colvin Hospital to understand the sequence of events leading to the killing of Ahmad and his brother on the night of April 15.
According to the minister, his son Vikas Kishore lives at his Lucknow residence but he was in Delhi when Vinay Srivastava, described as his friend, was murdered at the house.
The minister's son, Vikas Kishore, who lives in the house, was in Delhi at the time, when his friend Vinay Srivastava was shot in the head by his other friends.
A few distant relatives of Atiq and some people of the locality were allowed to go to the graveyard.
The police registered cases against 13 persons, associated with Hindu Mahasabha
Initial probe suggests that it is a case of money dispute between the two.
In Aligarh, District Magistrate Chandra Bhushan Singh told reporters that Kafeel Khan's speech at AMU was instrumental in triggering violent incidents at the university on December 13 and 15.
The charges against the men include promoting hatred and disrupting harmony, police said.
Police said security has been tightened at Tappal as a precautionary measure.
"She boldly confronted the attackers who were all wearing saffron scarfs," Abbasi said.
One of the men held earlier for the crime is an alleged sex offender who targeted children in recent years.
The students were booked under sedition charges after a complaint was filed by BJYM member Mukesh Lodhi.
Director General of Police O P Singh said that two people lost their lives in Bijnor and one each in Meerut, Sambhal and Firozabad. But officials reported a death in Kanpur as well.
Scores of Banaras Hindu University students also staged a protest at the Lanka Gate in support of the AMU students.
Two suspects have been arrested and police say the case is a fallout of a monetary dispute.
Twelve people, including 8 policemen, were injured on Monday in widespread violence and arson in Varanasi during a procession by seers and other locals.